A couple of weeks ago, I was doing a jigsaw puzzle with my nieces. They wanted to know how jigsaws were made, so we found a fascinating video explaining and demonstrating how the sharp cutting molds were made and worked. So I chose the jigsaw puzzle in question for this prompt, for the sharp edges of its pieces made with super sharp tools. ;o) (Also because I didn't have a better idea except taking pics of my kitchen knives..)
(And in case you're wondering, yes, the puzzle is upside down, I didn't notice when I took the pic. *g* )
For my father's 71st birtday last year, we did a family outing with an historical railbus. The trip was quite fun, even more so as the nieces were allowed to stand right in the front at the control stand and give a hoot every time we passed through a village. The pic shows the view through the front windows onto the small side line which is no longer used for regular traffic, just on Sundays for the historical trains and rail buses.